Earth Science - GRADE 9

They have a steep slope, wide crater and are the most abundant of

the three major volcano types.

• Stratovolcano

• Cinder Cone

• Shield

They can be easily identified because they are tall and broad, with flat, rounded shapes.

• Stratovolcano

• Cinder Cone

• Shield

They are large, typically steep sided, symmetrical cones of large dimension formed from alternating layers of lava flows, volcanic ash, cinders, blocks, and pyroclastic materials.

• Stratovolcano

• Cinder Cone

• Shield

MAUNA LOA is an example of

• Stratovolcano

• Cinder Cone

• Shield

Mt. Mayon is an example of

• Stratovolcano

• Cinder Cone

• Shield

Taal Volcano is an example of

• Stratovolcano

• Cinder Cone

• Shield

They are those volcanoes that have had at least one eruption during the past 10,000 years. They are those that erupted recently and still showing regular activity like emission of gases, lava and ash flows.

• Active

• Inactive Volcano

• Potentially Active

They are those that have not erupted for the last 10,000 years and is not expected to erupt again in a comparable time scale of the future. There are no signs of volcanic activity for a long period of time because magma supply is cut off. Also the physical form of the volcano has signs of intensive weathering and erosion

• Active

• Inactive

• Potentially Active

They are those that have no records of volcanic activity but are morphologically young-looking.

• Active

• Inactive

• Potentially Active

It is a stream-driven eruption as the hot rocks come in contact with water. It is short lived, characterized by ash columns but may be a beginning of a larger eruption.

• Phreatic

• Phreatomagmatic

• Strombolian

• Vulcanian